Feed-off-the-arm sewing machine



Oct. 13, 1931. w, M. HANNEMAN FEED OFF-THE-ARM SEWING MACHINE Filed Sept. 14, 1928 5 Sheets-Sheet l Oct. 13, 1931. w. M. HANNEMAN FEED-OFF-THEWXRM SEWING MACHINE Filed Sept. 14. 1928 5 Sheets-Sheet 2 Zlnvwntop Oct. 13,- 1931- w. M HANNEM AN FEEDOFFTHE-ARM SEWING MACHINE 5 Sheets-Sheet 4 m y y I $7 1 V v/w g3 a .m EWHWHU 1 m I z Get. 13, 1931. w. M. HANNEMAN 1,827,577

FEED-OFFTHE-ARM SEWING MACHINE Filed Sept. 14, 1928 5 Sheets-Sheet 5 Patented Oct. 13, 1931 .VJUNITED STATES PATENT OFFICE WALTER M. HANNEMAN, OF EVANSVILLE, INDIANA, ASSIGNOR TO UNION SPECIAL MACHINE (loMPA'NYeOF CHICAGO, ILLINOIS, ACORPORATION OF ILLINOIS rEEn-orr-TEE-ARM SEWING MACHINE Application filed September 14, 1928. Serial No. 305,945.

The invention relates to new and useful improvements in sewing machines wherein the material being stitched is fed off the end of an arm, and more particularly to a means for supporting and actuating a trimming mechanism and also a thread covering mech-' anism. I,

An object of the invention is to provide a sewing machine of the above type wherein the support for the trimming blade is operated by a direct connection to a rock shaft at therear of the machine and parallel with the overhanging arm, and wherein the thread hook for forminga loop in the cross thread is likewise directly operated by a link connection with said rock shaft.

A further object of the invention is to provide a sewing machine of the above type wherein the arm carrying the movable trimzoming blade is mounted on acollar which, in turn, is mounted on a sleeve surrounding the presser bar and extending therewith through the lower supporting lug on the needle head, saidsleeVe being connected to said bar so as to move endwise therewith and so as to oscillate freel thereon.

' A further -0 ject of the invention is to provide a sewingmachine of the above type wherein the thread hook is mounted on an arm carried by. a'yoke which, in turn, is mounted for free oscillation on the sleeve carrying the trimming blade and which is held from endwise movement by a supporting lug which lies between the arms of the yo e.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of 40.? illustration one embodiment of the invention Fig. 1 is a front view of aportion of a machine embodying the improvements.

Fig. 2 is a view of a portion of the work supporting arm in side elevation and of the overhanging arm in end elevation.

Fig. 3 is aview from the rear of the machine. p V Fig. 4 is a view showing the arrangement of thesleeve carrying the trimming blade on the presser bar and the yoke carrying the thread hook on the sleeve carrying the trimg base on which is mounted a work supporting arm. Also mounted on this supporting base is an overhanging arm having a needle head disposed above the free end of the work supporting-arm. Withinthe work supporting arm is a looper mechanism and a feeding mechanism arranged so as to feed the ma terial off the end of the arm as it is stitched.

Mounted for reciprocation in the needle head is a needle bar. 'A presser bar is also mounted in the needle head and carries a presser foot for holding the material on the work support. Surrounding said presser bar and extending through the lower supporting lug therefor is a sleeve which is free to oscillate in the lug and on the bar but which moves endwise with the presser bar. The movable trimming blade is carried by an arm clamped to the lower end of this sleeve. The sleeve adjacent its upper end is provided with a yoke which spans a collar secured to the presser bar and having connection with a guide bar for preventing the presser bar from turning. This yoke carries a ball stud to which a link is connected.

At the back of the machine there is a rock shaft with a depending arm and this link is connected to the arm so that the rock shaft imparts oscillations to the sleeve carrying the trimming blade. Also mounted on this sleeve is a yoke which spans the supporting lug for the sleeve and this yoke has an arm carrying a thread hook. The arm is con nected by a link toa depending arm on therock shaft and thus it is that the rock shaft oscillates the thread hook. This rock shaft porting arm carries a feed dog 3 and a looperL is oscillated by an eccentric strap cooperating with an eccentric on the main shaft.

Referring more in detail to the drawings, the sewing machine includes a base or standard l on which is mounted a work supporting arm'2. The free end of this work sup- Also mounted on the base or standard 1 is an overhanging arm 5. V Atthe outer end of th s a ov'erhanging'armis aneedle headit in which a needle bar 7 is mounted for reciprocation. Attached to the overhanging arm is aneedle lever 8 which is connected to the needle bar for reciprocating the same; The, matee rial is held on the work support bya presser foot" 9; This presser foot 9 is carried by a presser bar 10 mounted in lugs 11 and 12 formed as a part of the needle head.

Also mounted in the lower lug 12 is a guide ;;bar 13. "The presser bar is provided with a collar 14, which is secured the'reto'and this collar has'an arm 15 straddling the guide bar, which prevents. the presser bar from oscillating in its supporting bearing.

Surrounding the presser bar 10 is a sleeve 16. This sleeve is provided with an integral fixed collar 14 on the pres'ser bar. Thus it is that the sleeveis limited in its endwise move- .mentonthepresser bar. A spring 19 bears 7 against the collar 18 and normally forces the sleeve in a downward direction. At the lowai m l7 at its upper end and this arm 17 carries a projecting portion provided with a collar 18. The'colia r '18 and the end of the sleeve are disposed on opposite sides of the erfend of the sleeve 16 is a bracket arm 20 which carries the movable trimming blade 21. Said bracket armiscarried byacollar which surrounds the sleeve; said collar is split and 'vth'eends thereof are joined by a screw; This provides an adjustable mounting for the arm. n This blade 21 overlies a stationary blade 22 and the spring bearing on the collar yieldingly holds the movablefblade in shearing contact with the stationary blade. At the back of the machine there is a rock shaft 23. This rock shaft is oscillated by an eccentric strap 24' which cooperates with an eccentric on themain shaft; I At the outer end of the rock shaft there is a sleeve 25 which is fixedto the rock shaft. This sleeve is provided with an arm 26 extending in the general direction ofthe rock shaft, but ofi'set from the center thereof. On the outer end 1 of the arm. 26 is a ball stud 27;" A link 29 engages this ball stud 27 and also engages a ballstud 30 on} the arm 17 which is attached to the sleeve carryingfthe trimming blade the rock shaft oscillates this link will im- "part oscillations to the sleeve which will, vi turn, oscillateithe trimming blade,

1' Also mounted'onthis sleeve is a yoke member 31., Theyoke member 31' straddles the lower; bearing lug 12in which the sleeveis,

l1 mounted foroscillation. This oke member '31 isprovided with a laterally projecting" arm 32. Depending from the arm 32 is a sleeve member 33 in which the thread hook '34: is mounted. Also carried by the arm 32 is an upwardly extending member 35 on which a ball stud 36 is mounted;- A link 37 engages thisballstud and also engages a ballstud 38 at the lower end of a depending arm 39 fixed to the sleeve 25 on the rock shaft 23. When'this'rock' shaft oscillates "itjwill impart oscillations to the yoke, "which, in turn, will oscillate-the thread hook. The yoke supporting the thread hook is free to ;.oscillate about the center of the presser bar as an axis. It is, however, held from move ment up and down with the presser bar by reason'of the factthat it straddles the lower lug 12 on theneedle head. Associated with the thread hook'is a thread guide 40 carried by a fixed arm 41 attached-to-the needle head.

From-the above it will be apparent that the sewing machine is provided with devices for oscillating the movable trimmer blade and the thread hook which are of comparatively few parts, as the thread hook supportingvmeans is connected directly'bya link to' an arm on a rock shaft, while the-sleeve carry- 3 ing the arm supporting the trimming blade is likewise directlyconnected by alink" to an armon the same rock shaft. N 0t "only has the actuating mechanism been greatly simplified, but the supporting bearings for both the sleeve which carries the arm o n'which the trimming blade is mounted and" the yoke which carries the arm on which the thread hook is mounted are so constructed asto provide a very rigidsupport for'these members sothat they may be oscillated at very high speed and yet the parts'moved will be held to their proper paths of movement.

It will be obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit' of the invention as set forth in the appended claims Having fully described'my invention, what I claim as new and desire to secure by Letters Patent, is j 1. In a'sewing machine the combination of a movable trimming'blade carried by thearm,

said sleeve beingfree/to oscillate on'said.

presser bar". and limited in it .endwise movement thereon, a'rock shaft, and'i'a link" cone necting said ro'ck shaft to said sleeve for o'scillating thewsle evej. f j

a work s upport,-a needle. head directly above the free end gof said work support, a presser foot, a presser barmounted in" spaced lugs '2. In 'a sewing machine "the combination of.

in said needle head, a sleeve surrounding said presser bar and extending through the lower lug, an arm carried by the sleeve, a movable trimming blade carried by the arm, said sleeve being free to oscillate on said presser bar and limited in its endwise movement thereon, a rock shaft, a link connecting said rock shaft to said sleeve for oscillating the sleeve, a collar surrounding the presser bar connected to said sleeve and spaced from the end thereof, a spring surrounding the presser bar and bearing against said collar, a collar fixed'to the presser bar beneath the collar which is attached to the sleeve, and means cooperating with the collar fixed to the presser bar for preventing the presser bar from oscillating.

- 3. In a sewing machine the combination of a work support, a needle head directly above the free end of said work support, a presser bar mounted in spaced lugs in said needle head, a sleeve surrounding said presser bar and extending through said lower lug and free to oscillate therein, means for limiting the endwise movement on the presser bar, a trimming blade carriedby said sleeve, a yoke surrounding said sleeve and straddling the lower supporting bearing for said sleeve, a thread hook carried by said yoke, a horizontal rock shaft, an arm carried by the rock shaft, a link connecting said arm to said sleeve for oscillating the sleeve, a second arm depending from said rock shaft, and a link connecting said second arm with said yoke for oscillating the thread hook.

4. In a sewing machine the combination of a standard, an overhanging arm, a work support, a needle head at the outer end of the overhanging arm, a rock shaft extending lengthwise of the overhanging arm, a presser bar mounted in spaced bearings in the needle head, a presser foot carried thereby, a

sleeve surrounding said presser bar and extending through the lower lug and free to oscillate therein, means for limiting the end wise movement of the sleeve on the presser bar, an arm carried by the sleeve, a ball stud mounted on said arm, an arm projecting from said rock shaft, a ball stud thereon, a link connecting said ball studs, a yoke mounted on said sleeve and straddling the lower bearing, said yoke being free to oscillate on the sleeve and held by the bearing from endwise movement, a thread hook carried by said sleeve, a ball stud mounted on said sleeve, adepending arm carried by the rock shaft, a ball stud thereon, and a link connecting the lastnamed ball studs whereby the rock shaft oscillates the thread hook.

f In testimony whereof, I aflix my signature.

lVALTER M. HAN NEMAN. 

